辐射供冷与贴附射流复合空调.doc
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辐射供冷与贴附射流复合空调,摘 要在暖通空调领域，节能和环保成为国内外学者研究的重点。辐射供冷空调系统作为一种节能绿色空调系统，有着良好的应用前景。但是辐射供冷存在单位面积供冷能力较低、无法消除室内潜热负荷和辐射板表面易结露的缺点，成为该技术推广应用的主要障碍。基于这一背景，本文提出辐射供冷与贴附射流复合空调系统，该复合空调系统不仅能有效避免辐射...
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摘 要
在暖通空调领域，节能和环保成为国内外学者研究的重点。辐射供冷空调系统作为一种节能绿色空调系统，有着良好的应用前景。但是辐射供冷存在单位面积供冷能力较低、无法消除室内潜热负荷和辐射板表面易结露的缺点，成为该技术推广应用的主要障碍。基于这一背景，本文提出辐射供冷与贴附射流复合空调系统，该复合空调系统不仅能有效避免辐射板表面结露，而且通过贴附射流送风可以很好的满足室内空气品质要求。
本文以江苏科技大学现有的一个辐射供冷实验房间为主要研究对象，根据实验房间夏季时的热湿特点建立了物理模型，采用鸿业暖通空调负荷软件计算了实验房间的逐时显热冷负荷，确定了模型的相关参数。运用CFD软件进行数值模拟，首先确定了系统的送风参数，然后分别评价了采用贴附射流和普通送风两种方式下辐射供冷房间的温湿度场、速度场及其舒适性，结果表明，两种送风方式下房间内的热舒适性均较好，但在相同参数下采用贴附射流时，可有效避免冷辐射板表面结露。
影响辐射供冷与贴附射流复合空调系统的因素有很多，本文选择性的考察了送风量、室内设计参数、送风口宽度、冷辐射板高度以及湿源散湿量对系统的影响，旨在探讨改进复合系统的方法。
本文还对辐射供冷与贴附射流复合空调系统进行了实验研究，搭建了实验系统，对冷辐射板表面的结露现象及贴附射流气流组织进行了验证性实验，实验结果与数值模拟结果基本吻合。本文的研究成果对辐射供冷的防结露设计具有指导意义和实用价值。
关键词：辐射供冷；贴附射流；结露；负荷计算；数值模拟；实验研究
Abstract
In the HVAC field, energy saving and environmental protection have become the emphasis on the recent research of domestic and foreign scholars. As a kind of energy saving air-conditioning system, radiant cooling has a good application prospect. However, the existence of shortcomings, such as low cooling capacity on unit area, inability to eliminate the latent heat and the risk of condensation on radiant panels become major obstacles to limit the market penetration of radiant cooling. Based on this background, the combined air-conditioning system of radiant cooling and wall-attached-jet is proposed in this paper. The combined air-conditioning system not only can reduce the risk of condensation on radiant panels, but also the indoor air quality can meet the requirements of thermal comfort through the supply attached jet.
This paper choses a radiant cooling experimental room of Jiang Su University of Science and Technology as main research object. Physics models are established based on the indoor temperature and humidity characteristics in summer. Hourly indoor sensible heat cooling load is calculated by Hongye HVAC load computing software and the main parameters are determined. CFD software is used to simulate. Air supply parameters are firstly determined. Then, the wall-attached-jet and ordinary air-supply are respectively simulated to study indoor air temperature field，humidity field，velocity field and thermal comfort field. The results show that the wall-attached-jet can effectively reduce the risk of condensation on cold panel.
There are many factors that affect the combined air-conditioning system of radiant cooling and wall-attached-jet. In order to investigate the improvement of the system, this paper inspects the influences of different supply air volume, indoor design parameter, air diffuser width, cold panel height and moisture gain.
This paper also does the experimental study to the combined air-conditioning system and builds the experiment system. Through the experimental observation of the phenomenone of condensation on the cold panel and the wall-attached-jet flow field, the experiment has the same results with the numerical calculations. The result of this research has much theoretical and utilizable value for the design of anti-condensation of radiant cooling.
Keywords: radiant cooling; wall-attached-jet; condensation; load calculation; simulation; experimental study
目 录
摘 要 1
Abstract III
第1章 绪论 1
1.1 课题的研究背景 1
1.2 国内、外研究现状 2
1.2.1 辐射供冷防结露问题的研究 2
1.2.2 辐射供冷技术的研究 3
1.2.3 射流领域的研究 4
1.3 本文的研究内容与方法 5
第2章 辐射供冷与贴附射流复合空调系统理论分析 7
2.1 辐射供冷与贴附射流复合空调系统简介 7
2.1.1 辐射供冷与贴附射流复合空调系统工作原理 7
2.1.2 辐射供冷与贴附射流复合空调系统末端形式 7
2.2 贴附射流理论 9
2.2.1 射流的分类 9
2.2.2 自由紊动射流 9
2.2.3 竖壁贴附射流 11
2.3贴附射流与常规送风下冷辐射板供冷量对比 14
2.4 本章小结 14
第3章 实验房间参数以及数学物理模型的确定 15
3.1 室内冷负荷的计算 15
3.1.1 得热与冷负荷 15
3.1.2负荷计算结果 16
3.1.3 新风量的确定 17
3.2 实验房间数学模型的建立 18
3.2.1 CFD软件简介 18
3.2.2 控制方程 19
3.2.3 湍流模型 20
3.2.4 辐射模型 21
3.3 房间物理模型的建立 22
3.3.1 空间几何模型 22
3.3.2 模型的物理参数 23
3.3.3 网格的划分 23
3.3.4 压力速度耦合 24
3.3.5 收敛判断依据 24
3.4 本章小结 24
第4章 辐射供冷与贴附射流复合空调系统数值模拟 25
4.1 贴附射流送风参数的确定 25
4.1.1 冷辐射表面结露可能性的比较分析 26
4.1.2 室内流场的比较分析 27
4.2 辐射供冷与贴附射流复合空调系统数值计算结果分析..
在暖通空调领域，节能和环保成为国内外学者研究的重点。辐射供冷空调系统作为一种节能绿色空调系统，有着良好的应用前景。但是辐射供冷存在单位面积供冷能力较低、无法消除室内潜热负荷和辐射板表面易结露的缺点，成为该技术推广应用的主要障碍。基于这一背景，本文提出辐射供冷与贴附射流复合空调系统，该复合空调系统不仅能有效避免辐射板表面结露，而且通过贴附射流送风可以很好的满足室内空气品质要求。
本文以江苏科技大学现有的一个辐射供冷实验房间为主要研究对象，根据实验房间夏季时的热湿特点建立了物理模型，采用鸿业暖通空调负荷软件计算了实验房间的逐时显热冷负荷，确定了模型的相关参数。运用CFD软件进行数值模拟，首先确定了系统的送风参数，然后分别评价了采用贴附射流和普通送风两种方式下辐射供冷房间的温湿度场、速度场及其舒适性，结果表明，两种送风方式下房间内的热舒适性均较好，但在相同参数下采用贴附射流时，可有效避免冷辐射板表面结露。
影响辐射供冷与贴附射流复合空调系统的因素有很多，本文选择性的考察了送风量、室内设计参数、送风口宽度、冷辐射板高度以及湿源散湿量对系统的影响，旨在探讨改进复合系统的方法。
本文还对辐射供冷与贴附射流复合空调系统进行了实验研究，搭建了实验系统，对冷辐射板表面的结露现象及贴附射流气流组织进行了验证性实验，实验结果与数值模拟结果基本吻合。本文的研究成果对辐射供冷的防结露设计具有指导意义和实用价值。
关键词：辐射供冷；贴附射流；结露；负荷计算；数值模拟；实验研究
Abstract
In the HVAC field, energy saving and environmental protection have become the emphasis on the recent research of domestic and foreign scholars. As a kind of energy saving air-conditioning system, radiant cooling has a good application prospect. However, the existence of shortcomings, such as low cooling capacity on unit area, inability to eliminate the latent heat and the risk of condensation on radiant panels become major obstacles to limit the market penetration of radiant cooling. Based on this background, the combined air-conditioning system of radiant cooling and wall-attached-jet is proposed in this paper. The combined air-conditioning system not only can reduce the risk of condensation on radiant panels, but also the indoor air quality can meet the requirements of thermal comfort through the supply attached jet.
This paper choses a radiant cooling experimental room of Jiang Su University of Science and Technology as main research object. Physics models are established based on the indoor temperature and humidity characteristics in summer. Hourly indoor sensible heat cooling load is calculated by Hongye HVAC load computing software and the main parameters are determined. CFD software is used to simulate. Air supply parameters are firstly determined. Then, the wall-attached-jet and ordinary air-supply are respectively simulated to study indoor air temperature field，humidity field，velocity field and thermal comfort field. The results show that the wall-attached-jet can effectively reduce the risk of condensation on cold panel.
There are many factors that affect the combined air-conditioning system of radiant cooling and wall-attached-jet. In order to investigate the improvement of the system, this paper inspects the influences of different supply air volume, indoor design parameter, air diffuser width, cold panel height and moisture gain.
This paper also does the experimental study to the combined air-conditioning system and builds the experiment system. Through the experimental observation of the phenomenone of condensation on the cold panel and the wall-attached-jet flow field, the experiment has the same results with the numerical calculations. The result of this research has much theoretical and utilizable value for the design of anti-condensation of radiant cooling.
Keywords: radiant cooling; wall-attached-jet; condensation; load calculation; simulation; experimental study
目 录
摘 要 1
Abstract III
第1章 绪论 1
1.1 课题的研究背景 1
1.2 国内、外研究现状 2
1.2.1 辐射供冷防结露问题的研究 2
1.2.2 辐射供冷技术的研究 3
1.2.3 射流领域的研究 4
1.3 本文的研究内容与方法 5
第2章 辐射供冷与贴附射流复合空调系统理论分析 7
2.1 辐射供冷与贴附射流复合空调系统简介 7
2.1.1 辐射供冷与贴附射流复合空调系统工作原理 7
2.1.2 辐射供冷与贴附射流复合空调系统末端形式 7
2.2 贴附射流理论 9
2.2.1 射流的分类 9
2.2.2 自由紊动射流 9
2.2.3 竖壁贴附射流 11
2.3贴附射流与常规送风下冷辐射板供冷量对比 14
2.4 本章小结 14
第3章 实验房间参数以及数学物理模型的确定 15
3.1 室内冷负荷的计算 15
3.1.1 得热与冷负荷 15
3.1.2负荷计算结果 16
3.1.3 新风量的确定 17
3.2 实验房间数学模型的建立 18
3.2.1 CFD软件简介 18
3.2.2 控制方程 19
3.2.3 湍流模型 20
3.2.4 辐射模型 21
3.3 房间物理模型的建立 22
3.3.1 空间几何模型 22
3.3.2 模型的物理参数 23
3.3.3 网格的划分 23
3.3.4 压力速度耦合 24
3.3.5 收敛判断依据 24
3.4 本章小结 24
第4章 辐射供冷与贴附射流复合空调系统数值模拟 25
4.1 贴附射流送风参数的确定 25
4.1.1 冷辐射表面结露可能性的比较分析 26
4.1.2 室内流场的比较分析 27
4.2 辐射供冷与贴附射流复合空调系统数值计算结果分析..
